Apology Letter For Cheating in Exam

This is the letter to convey my apology for cheating in exam by mal practicing during the exam hours. First of all I should regret for my behaviour and I regret for it in a very precise manner. During the exam time of Engineering Mechanics I have I undergone mal practice by using a bit for 3 chapters. I don’t think sorry would be the right word to ask for apologise. But there is no other go. And so I request you to accept my apology for all my behaviour. And let me swear you that I will not behave / do mistake one more time. Let this be a lesson for me.